Mechanical telephone



(No Model.) I F. R. SHAW.

MECHANICAL TELEPHONE.

No. 328,258. Patented Oct. 13, 1885.

INVENTOR ATTORNEYS.

Nv PETERS, Pholu-Uihortphlr. Wathinflon, D. C.

UNITED STATES PATENT OFFICE.

FRANCIS R. SHAW, OF CHATHAM CENTRE, OHIO.

MECHANICAL TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 328,258, dated October13, 1885.

Application filed May 26, 1885. Serial No. 166,740.

To all whom it may concern.-

Be it known that I, FRANCIS R. SHAW, of Ohatham Cent-re, Medina county,Ohio, have invented a new and Improved Mechanical Telephone, of whichthe following is a full, clear, and exact description.

The object of my invention is to provide a new and improvedsound-transmitting instrument for mechanical telephone-lines.

The invention consists in the peculiar construction and arrangement ofparts, as hereinafter fully described, and pointed out in the claim.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in both figures.

Figure 1 is a rear view of my improved mechanical telephone, and Fig. 2isa cross-sectional elevation of the same on the line 00 00, Fig. 1.

The diaphragm A, made of some suitable fabric or fibrous material, isheld in the circular frame B in the usual manner. It may be strengthenedon the back by crossed bands 0, of duck or canvas. Two or more bands,

D, of duck,- canvas, or any other fibrous material, are secured to theback of the diaphragm (No model.)

and crossed, and the conducting-wire E is passed through the crossedbands at the intersection and held to the same by forming ahead orenlargement on the end of the wire.

As shown in the drawings, small loops F are held on the back of thediaphragm, and are connected with the ends of the bands 0 by metalrivets G.

I have shown two crossed bands; but any number may be used, so that thesound can only be transmitted between the line-wire and the diaphragmthrough the said bands D, whereby the harsh metallic ring is avoidedwhich is produced when the connections between the line-wire and thediaphragm are made of metal. 7

Having thus described my invention, I claim as new and desire to secureby Letters Patent- In a telephone, the combination, with the diaphragm Aof fibrous material, having the loops F secured thereto, of the linewire connecting-strips D,crossing each other and havv ing their endssecured to the said loops, sub stantially as herein shown and described.

FRANCIS R. SHAW. Witnesses:

L. M. GRANT, J. O. SNELL.

